12121817 has 8 divisors (see below), whose sum is σ = 12432000. Its totient is φ = 11813904.

The previous prime is 12121807. The next prime is 12121819. The reversal of 12121817 is 71812121.

12121817 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12121817 - 2⁴ = 12121801 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12121792 and 12121801.

It is not an unprimeable number, because it can be changed into a prime (12121819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16034 + ... + 16772.

It is an arithmetic number, because the mean of its divisors is an integer number (1554000).

Almost surely, 2^12121817 is an apocalyptic number.

It is an amenable number.

12121817 is a deficient number, since it is larger than the sum of its proper divisors (310183).

12121817 is an equidigital number, since it uses as much as digits as its factorization.

12121817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1135.

The product of its digits is 224, while the sum is 23.

The square root of 12121817 is about 3481.6399871325. The cubic root of 12121817 is about 229.7149398504.

Adding to 12121817 its reverse (71812121), we get a palindrome (83933938).

The spelling of 12121817 in words is "twelve million, one hundred twenty-one thousand, eight hundred seventeen".